A watering device is provided that includes a receptacle and a sponge wick. The receptacle includes a reservoir and a probe. The probe projects from the reservoir and is adapted to extend into potting mix in a plant pot. The probe is also adapted to hook on to the rim of the plant pot in order to support the device thereon. The wick is adapted to extend from the reservoir within or along the probe and into the potting mix in the plant pot. The wick includes non-woven Polyvinyl Alcohol fibres which are bound by a Polyvinyl Alcohol foam resin.